[Python知识库]odoo15 异常错误，在13，14中正常

field_id = fields.Many2one('ir.model.fields', string=u'模型字段', required=True)

这句话，引发异常如下：

Traceback (most recent call last):
  File "G:\od15\odoo\addons\base\models\ir_http.py", line 237, in _dispatch
    result = request.dispatch()
  File "G:\od15\odoo\http.py", line 688, in dispatch
    result = self._call_function(**self.params)
  File "G:\od15\odoo\http.py", line 360, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "G:\od15\odoo\service\model.py", line 94, in wrapper
    return f(dbname, *args, **kwargs)
  File "G:\od15\odoo\http.py", line 349, in checked_call
    result = self.endpoint(*a, **kw)
  File "G:\od15\odoo\http.py", line 917, in __call__
    return self.method(*args, **kw)
  File "G:\od15\odoo\http.py", line 536, in response_wrap
    response = f(*args, **kw)
  File "G:\od15\odoo\addons\web\controllers\ma

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